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Message from a human gut symbiont: sensitivity is a prerequisite for sharing
Jian Xu1, Herbert C Chiang, Magnus K Bjursell
1Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, MO 63110, USA.
Trends in Microbiology
|January 1, 2004
Summary
Bacteroides thetaiotaomicron possesses a complex system for sensing its environment, enabling it to process dietary nutrients and maintain beneficial human gut symbiosis. This highlights microbial adaptation strategies.
Area of Science:
- Microbiology
- Genomics
- Human Microbiome Research
Background:
- The human intestine harbors a vast microbial community, with Bacteroides species constituting a significant portion of adult gut microbiota.
- Understanding the molecular mechanisms of human-bacterial symbioses is crucial for advancing microbiome research.
Purpose of the Study:
- To investigate the environmental-sensing capabilities of the prominent human intestinal symbiont, Bacteroides thetaiotaomicron.
- To elucidate the molecular strategies employed by B. thetaiotaomicron for nutrient acquisition and symbiotic relationship maintenance.
Main Methods:
- Genome sequencing and proteome analysis of Bacteroides thetaiotaomicron.
- Bioinformatic identification and characterization of environmental-sensing systems, including extracytoplasmic function (ECF) sigma-factors and hybrid two-component systems.
Main Results:
- B. thetaiotaomicron exhibits an elaborate environmental-sensing apparatus, featuring a high number of ECF sigma-factors.
- Novel hybrid two-component systems, comprising membrane-spanning proteins with diverse functional domains, were identified.
- These sensor systems are intricately linked to genes responsible for the acquisition and processing of dietary polysaccharides (the glycobiome).
Conclusions:
- B. thetaiotaomicron has evolved sophisticated mechanisms to detect and respond to its intestinal niche conditions.
- This sensory apparatus is key to the symbiont's ability to utilize dietary glycans and sustain its beneficial relationship with the human host.
- The findings provide insights into the molecular basis of successful microbial symbiosis in the human gut.